Any person, or group of people, can decide how they wish to refer to anything. 
 
If a person, or group of people, wish to refer to a keris with no luk, but with a blade that is clearly lurus as "luk satu", well, so be it. That is their decision. 
 
However, according to what I have been taught, there is no such thing as "luk satu". 
 
One luk does not exist, and logically cannot exist. 
 
But anybody at all is entitled to his own opinion.
		 
		
		
		
		
		
		
		
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